I believe that his sister rode the farthest because kilometer means 1000 meters , so 3000 meters is equal to 3km.... 3km>2km
one kilometers is 1000 meters. so 2 times 1000 is 2000 meters. And since Sally rode 3000 meters she rode 1000 meters further.
Sally rode the farthest, covering a distance of 3 kilometers, while John rode 2 kilometers. Sally rode 1 kilometer farther than John. This shows that converting between units can help in comparing distances more straightforwardly.
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